mirror of
https://github.com/processone/ejabberd.git
synced 2024-11-04 15:36:57 +01:00
148 lines
4.7 KiB
Erlang
148 lines
4.7 KiB
Erlang
%% Usage:
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%% In config file:
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%% {mod_mnesia_mgmt, [{logdir, "/tmp/xmpplogs/"}]},
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%% From Erlang shell:
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%% mod_mnesia_mgmt:start("localhost", []).
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%% mod_mnesia_mgmt:stop("localhost").
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-module(mod_mnesia_mngt).
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-author('mremond@process-one.net').
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-behaviour(gen_mod).
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-behavior(gen_server).
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-export([start/2, start_link/2, stop/1]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-include("ejabberd.hrl").
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-include("jlib.hrl").
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-record(modstate, {host, logdir, iodevice, timer}).
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-define(SUPERVISOR, ejabberd_sup).
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-define(PROCNAME, mod_mnesia_mgmt).
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-define(STANDARD_ACCEPT_INTERVAL, 20). %% accept maximum one new connection every 20ms
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-define(ACCEPT_INTERVAL, 200). %% This is used when Mnesia is overloaded
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-define(RATE_LIMIT_DURATION, 120000). %% Time during which the rate limitation need to be maintained
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%%====================================================================
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%% gen_mod callbacks
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%%====================================================================
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start(Host, Opts) ->
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Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
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Spec = {Proc, {?MODULE, start_link, [Host, Opts]},
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transient, 2000, worker, [?MODULE]},
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supervisor:start_child(?SUPERVISOR, Spec).
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stop(Host) ->
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Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
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gen_server:call(Proc, stop),
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supervisor:delete_child(?SUPERVISOR, Proc).
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start_link(Host, Opts) ->
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Proc = gen_mod:get_module_proc(Host, ?PROCNAME),
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gen_server:start_link({local, Proc}, ?MODULE, [Host, Opts], []).
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%%====================================================================
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%% gen_server callbacks
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%%====================================================================
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init([Host, Opts]) ->
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?INFO_MSG("Starting mod_mnesia_mgmt for: ~p", [Host]),
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ejabberd_listener:rate_limit([5222, 5223], ?STANDARD_ACCEPT_INTERVAL),
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MyHost = gen_mod:get_opt_host(Host, Opts, "mnesia_mngt.@HOST@"),
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Logdir = gen_mod:get_opt(logdir, Opts, "/tmp/xmpplogs/"),
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make_dir_rec(Logdir),
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{ok, IOD} = file:open(filename(Logdir), [append]),
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mnesia:subscribe(system),
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{ok, #modstate{host = MyHost, logdir = Logdir, iodevice = IOD}}.
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terminate(_Reason, #modstate{host = Host, iodevice = IOD}) ->
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?INFO_MSG("Stopping mod_mnesia_mgmt for: ~s", [Host]),
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mnesia:unsubscribe(system),
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file:close(IOD).
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handle_call(stop, _From, State) ->
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{stop, normal, ok, State};
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handle_call(_Req, _From, State) ->
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{reply, {error, badarg}, State}.
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handle_cast(_Msg, State) ->
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{noreply, State}.
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handle_info({mnesia_system_event,{mnesia_overload, {mnesia_tm, message_queue_len, Values}}},
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#modstate{iodevice = IOD, timer = Timer} = State) ->
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Line = io_lib:format("~s - Mnesia overload due to message queue length (~p)",
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[timestamp(), Values]),
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file:write(IOD, Line),
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reset_timer(Timer),
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{messages, Messages} = process_info(whereis(mnesia_tm), messages),
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log_messages(IOD, Messages, 20),
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{noreply, State#modstate{timer = undefined}};
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handle_info({mnesia_system_event,{mnesia_overload, Details}},
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#modstate{iodevice = IOD, timer = Timer} = State) ->
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Line = io_lib:format("~s - Mnesia overload: ~p",
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[timestamp(), Details]),
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file:write(IOD, Line),
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reset_timer(Timer),
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{noreply, State};
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handle_info({mnesia_system_event, _Event}, State) ->
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%% TODO: More event to handle
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{noreply, State};
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handle_info(_Info, State) ->
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{noreply, State}.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%% Generate filename
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filename(LogDir) ->
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Filename = lists:flatten(timestamp()) ++ "-mnesia.log",
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filename:join([LogDir, Filename]).
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%% Generate timestamp
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timestamp() ->
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{Y,Mo,D} = erlang:date(),
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{H,Mi,S} = erlang:time(),
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io_lib:format("~4.4.0w~2.2.0w~2.2.0w-~2.2.0w~2.2.0w~2.2.0w", [Y,Mo,D,H,Mi,S]).
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%% Create dir recusively
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make_dir_rec(Dir) ->
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case file:read_file_info(Dir) of
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{ok, _} ->
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ok;
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{error, enoent} ->
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DirS = filename:split(Dir),
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DirR = lists:sublist(DirS, length(DirS)-1),
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make_dir_rec(filename:join(DirR)),
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file:make_dir(Dir)
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end.
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%% Write first messages to log file
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log_messages(_IOD, _Messages, 0) ->
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ok;
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log_messages(_IOD, [], _N) ->
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ok;
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log_messages(IOD, [Message|Messages], N) ->
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Line = io_lib:format("** ~w",
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[Message]),
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file:write(IOD, Line),
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log_messages(IOD, Messages, N-1).
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reset_timer(Timer) ->
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cancel_timer(Timer),
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ejabberd_listener:rate_limit([5222, 5223], ?ACCEPT_INTERVAL),
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timer:apply_after(?RATE_LIMIT_DURATION, ejabberd_listener, rate_limit, [[5222, 5223], ?STANDARD_ACCEPT_INTERVAL]).
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cancel_timer(undefined) ->
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ok;
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cancel_timer(Timer) ->
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timer:cancel(Timer).
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